[orca] Chromium: Ignore busy-changed events from pages which report size of 0

[Joanmarie Diggs <joanied src gnome org>]

commit dc584d8f7c99522bfc95c0d2744b2b8c67b7e81f
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Mon Nov 12 14:40:24 2018 -0500

    Chromium: Ignore busy-changed events from pages which report size of 0

 src/orca/scripts/toolkits/Chromium/script.py | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/src/orca/scripts/toolkits/Chromium/script.py b/src/orca/scripts/toolkits/Chromium/script.py
index f87a0e28a..2979cf02a 100644
--- a/src/orca/scripts/toolkits/Chromium/script.py
+++ b/src/orca/scripts/toolkits/Chromium/script.py
@@ -158,6 +158,11 @@ class Script(web.Script):
     def onBusyChanged(self, event):
         """Callback for object:state-changed:busy accessibility events."""
 
+        if self.utilities.hasNoSize(event.source):
+            msg = "CHROMIUM: Ignoring event from page with no size."
+            debug.println(debug.LEVEL_INFO, msg, True)
+            return
+
         if super().onBusyChanged(event):
             return